CN203373657U - Assembly type girder with lengthened upper chords - Google Patents
Assembly type girder with lengthened upper chords Download PDFInfo
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- CN203373657U CN203373657U CN201320396187.2U CN201320396187U CN203373657U CN 203373657 U CN203373657 U CN 203373657U CN 201320396187 U CN201320396187 U CN 201320396187U CN 203373657 U CN203373657 U CN 203373657U
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Abstract
The utility model relates to an assembly type girder with lengthened upper chords. The girder comprises a plurality of unit trusses, wherein the two ends of each unit truss are provided with a male head and a female head, the male heads and the female heads of the all the unit trusses are connected through truss pins after being sequentially connected in series, each unit truss comprises an upper chord and a lower chord, and the upper chords and the lower chords are, assembled, welded and fixed through vertical rods and inclined rods. The girder is characterized in that for the unit trusses within the span of the girder, the length of the upper chords of part or all of the unit trusses are larger than that of the lower chords of the unit trusses. The assembly type girder with the lengthened upper chords is simple in structure, conforms to design requirements and solves the problem that the girder bends downwards.
Description
[technical field]
The utility model relates to a kind of upper chord extended type assembling girder.
[background technology]
Assembly type steel bridge on highway truss (hereinafter to be referred as " truss "), be commonly called as " Bailey bracket ", " Bailey truss " or " shellfish thunder sheet ", is one of main load assembly of assembly type steel bridge on highway, and 321 types and two kinds of structural shapes of 200 types are arranged.Figure 11 is 321 type truss, by Components Compositions such as a cloudy montant, brace, upper chord, middle montant, lower chord, sun montants, is welded.
Its main material specification is: a cloudy montant, middle montant, a sun montant, brace are i iron No. 8, and upper and lower chord member is No. 10 channel-section steels.Its principal character size is: yin, yang head aperture is
vertical pitch-row is that H=1400, transverse holes are apart from being L
2=3000.Figure 12 is 200 type truss, by Components Compositions such as a cloudy montant, brace, upper chord, middle montant, lower chord, sun montants, is welded.Its main material specification is: a cloudy montant, middle montant, a sun montant, brace are channel-section steel No. 8, and upper and lower chord member is No. 10 channel-section steels.Its principal character size is: yin, yang head aperture is
vertical pitch-row is that H=2134, transverse holes are apart from being L
2=3048.Link up (Fig. 3) with the truss pin between truss and truss, link up (a slice truss of many rows is called one " joint ") with bracing frame between many row's truss, between double-deck truss, by Bolt Connection, get up, just can be assembled into and meet multiple 321 types or 200 type assembly type steel bridge on highway girders across footpath and the combination of multiple supporting capacity, lay again crossbeam and bridge deck member thereon, and install other member additional at two ends, just can become 321 types or 200 type assembly type steel bridge on highway.
Truss, as a substantially assembled unit, also can be used to be assembled into the lifting appliance girder, as shown in Figure 13-14.When lifting appliance is unloaded, under the girder Gravitative Loads, girder upper chord pressurized, the lower chord tension because between truss yin, yang head pin-and-hole and truss pin, the gap that is 0.6mm to the maximum is arranged, thus girder by downwarp, the lower amount of deflection of generation is called non-resilient amount of deflection, uses f
mmean; Amount of deflection f under the elasticity that the girder deadweight produces
0mean the lower amount of deflection f of girder
under=f
m+ f
0.When design lifting appliance girder, spend greatly and dolly is glided voluntarily or produce the climbing phenomenon because of downwarp after carrying in order to prevent girder, girder should be designed to have camber f, its value is generally f=(0.9～1.4) S/1000(S is the crane span).Obviously, truss assembled lifting appliance girder is because having lower amount of deflection f
underand can not meet this requirement.
The utility model is being made in such cases.
[utility model content]
The purpose of this utility model is to overcome the deficiencies in the prior art and provide a kind of simple in structure, meets designing requirement, solves the upper chord extended type assembling girder of curved problem under girder.
For above-mentioned purpose, the utility model by the following technical solutions:
A kind of upper chord extended type assembling girder, comprise a plurality of unit truss 1, the two ends of described unit truss 1 are respectively equipped with positive 11 and cloudy 12, the sun of unit truss 1 11, after series connection, by truss pin 2, link up successively for cloudy 12, described unit truss 1 includes upper chord 3, lower chord 5, upper chord 3 and lower chord 5 are fixed by montant 4 and brace 6 assembly weldings; It is characterized in that having in the unit truss between described girder span the length of Length Ratio lower chord 5 of upper chord 3 of part or all of unit truss long.
A kind of upper chord extended type assembling girder as above, the joint number that it is characterized in that the unit truss between described girder span is even number, the long a of length of the Length Ratio lower chord of the upper chord of symmetrical unit truss in the middle of described girder span, total amount of elongation of the upper chord of unit truss is 2b=an
1; N wherein
1meaning the joint number of the unit truss that upper chord lengthens, is even number, and n
1the joint number that is less than or equal to the unit truss between the girder span;
, f
on=f
under+ f, f
under=f
m+ f
0, f=(0.9～1.4) and S/1000, therefore
; Wherein H means the vertical pitch-row of a unit truss, f
onthe value of raising that means the middle interface of lower chord, f
underthe lower amount of deflection that means girder, f
mmean non-resilient amount of deflection, f
0mean elastic deflection; F means the camber of girder, and S means the span of girder.
A kind of upper chord extended type assembling girder as above, the amount of elongation a that it is characterized in that described unit pricncipal rafter is the a/2 that respectively stretches out on the sun head at upper chord and cloudy head.
A kind of upper chord extended type assembling girder as above, the joint number that it is characterized in that the unit truss between the girder span is odd number, the long a of length of the Length Ratio lower chord of the upper chord of the unit truss in the middle of described girder span, total amount of elongation of upper chord is 2b=an
1, n wherein
1the joint number that means the unit truss that upper chord lengthens, and n
1the joint number that is less than or equal to the unit truss between the girder span;
, f
on=f
under+ f, f
under=f
m+ f
0, f=(0.9～1.4) and S/1000, therefore
; Wherein H means the vertical pitch-row of a unit truss, f
onthe value of raising that means the middle interface of lower chord, f
underthe lower amount of deflection that means girder, f
mmean non-resilient amount of deflection, f
0mean elastic deflection; F means the camber of girder, and S means the span of girder, L
2the transverse holes distance that means the unit truss.
A kind of upper chord extended type assembling girder as above, the amount of elongation a that it is characterized in that described unit pricncipal rafter is the a/2 that respectively stretches out on the sun head at upper chord and cloudy head.
The beneficial effects of the utility model have:
The length of the Length Ratio lower chord of the upper chord of the part or all of unit truss between girder span of the present utility model is long, thereby makes truss assembled lifting appliance girder have camber.Symmetrical structure of changing the middle the right and left of girder span unit truss, lengthen its upper chord, thereby the girder upper chord lengthened; Each upper chord amount of elongation that saves the unit truss equates, and on truss, the position of other member is all constant, thereby makes the girder upper chord be longer than the girder lower chord.Solved the problem of girder bending-down.
The utility model also has simple in structurely in addition, meets the advantages such as designing requirement.
[accompanying drawing explanation]
Fig. 1 is not for the girder of cantilever arch schematic diagram.
Fig. 2 is the girder arch schematic diagram with cantilever
Fig. 3 is the schematic diagram that the unit truss connects by the truss pin.
Fig. 4 is that 321 type even number joint girders calculate schematic diagram.
Fig. 5 is that 321 type odd number joint girders calculate schematic diagram.
Fig. 6 is that 200 type even number joint girders calculate schematic diagram.
Fig. 7 is that 200 type odd number joint girders calculate schematic diagram.
The front elevational schematic that Fig. 8 is the utility model 321 type unit truss.
The schematic top plan view that Fig. 9 is the utility model 321 type unit truss.
The schematic diagram that Figure 10 is the utility model 200 type unit truss.
The schematic diagram of the 321 type unit truss that Figure 11 is prior art.
The schematic diagram of the 200 type unit truss that Figure 12 is prior art.
Figure 13 be prior art not with the schematic diagram of the girder of cantilever.
The schematic diagram of the girder with cantilever that Figure 14 is prior art
[specific embodiment]
Below in conjunction with accompanying drawing and embodiment, the utility model is elaborated:
As shown in Figure 1-2, a kind of upper chord extended type assembling girder, include a plurality of unit truss 1, the two ends of described unit truss 1 are respectively equipped with sun 11 and cloudy 12, the sun of unit truss 1 11, after series connection, by truss pin 2, link up successively for cloudy 12.Described unit truss 1 includes upper chord 3, lower chord 5, and upper chord 3 and lower chord 5 are fixed by montant 4 and brace 6 assembly weldings.Form the upper chord 7 of described girder after upper chord 3 coupled in series of described a plurality of unit truss 1.Form the lower chord 8 of described girder after lower chord 5 coupled in series of described a plurality of unit truss 1.Between described girder span, in a plurality of unit truss 1, there is the length of Length Ratio lower chord 5 of upper chord 3 of part or all of unit truss 1 long.The length of the Length Ratio lower chord 8 of the upper chord 7 of described girder is long.
Because girder is that unit truss series connection is assembled, therefore the joint number n of the unit truss between the girder span has dividing of even number and odd number.Below introduce respectively in two kinds of situation:
As shown in Fig. 4,6.When the joint number n of the unit truss 1 between described girder span is even number, the long 2b of length of the Length Ratio lower chord 8 of described girder upper chord 7, between the girder span, the amount of elongation sum of the upper chord of unit truss is 2b.Wherein
, f
on=f
under+ f, f
under=f
m+ f
0, f=(0.9～1.4) and S/1000, therefore
.Wherein H means the vertical pitch-row of a unit truss, f
onthe value of raising that means the middle interface of lower chord, f
underthe lower amount of deflection that means girder, f
mmean non-resilient amount of deflection, f
0mean elastic deflection; F means the camber of girder, and S means the span of girder.From each first segment truss of the right and left in the middle of the girder span, left and right symmetrically lengthens the upper chord of unit truss, and the amount of elongation of every joint unit pricncipal rafter is equal, and amount of elongation is a=2b/n
1.N wherein
1meaning the joint number of the unit truss that upper chord lengthens, is even number, and n
1≤ n.Wherein n means the joint number of the unit truss between the girder span.The unit truss number that in girder, upper chord lengthens is m=cn altogether
1.Wherein c means the row of girder truss.
In order to make the girder truss stressed evenly, after should lengthening pricncipal rafter, the amount of elongation a of pricncipal rafter is the a/2 that respectively stretches out on the sun at upper chord 11 and cloudy 12.
Another kind of situation, as shown in Fig. 5,7.When the joint number n of the unit truss 1 between described girder span is odd number, the long 2b of length of the Length Ratio lower chord 8 of described girder upper chord 7.The amount of elongation sum that is the upper chord of unit truss between the girder span is 2b.Wherein
, f
on=f
under+ f, f
under=f
m+ f
0, f=(0.9～1.4) and S/1000, therefore
; Wherein H means the vertical pitch-row of a unit truss, f
onthe value of raising that means the middle interface of lower chord, f
underthe lower amount of deflection that means girder, f
mmean non-resilient amount of deflection, f
0mean elastic deflection, f means the camber of girder, and S means the span of girder, L
2transverse holes distance for the unit truss.From girder span temporary location truss, left and right symmetrically lengthens the upper chord of unit truss, and the amount of elongation of every joint unit pricncipal rafter is equal, and amount of elongation is a=2b/n
1.N wherein
1the joint number that means the unit truss that upper chord lengthens.n
1≤n。Wherein n means the joint number of the unit truss between the girder span.Work as n
1, only lengthen the upper chord of middle node unit truss at=1 o'clock.Work as n
1during for odd number, the unit truss joint that upper chord lengthens comprises middle node; Work as n
1during for even number, the unit truss joint that upper chord lengthens does not comprise middle node.The unit truss number that in girder, upper chord lengthens is m=cn altogether
1.Wherein c means the row of girder truss.
In order to make the girder truss stressed evenly, after should lengthening the unit pricncipal rafter, the amount of elongation a of unit pricncipal rafter is the a/2 that respectively stretches out on the sun at upper chord 11 and cloudy 12.
Below to take single 321 type truss assembled girders be example, its principle (mm of unit) is described:
As shown in Figure 4, when the truss joint number n between the girder span is even number, after removing the truss pin at the middle interface of girder upper chord place, the middle interface of lower chord can be raised.Because gapped between truss pin and pin-and-hole, girder can elongate a little, so girder will be around the rotation of the truss pin at bearing pin-and-hole A, C and middle pin-and-hole B tri-places, and the girder span is constant.After in the middle of the girder lower chord, interface is raised, in the middle of upper chord, the interface place will separate, and the distance between pin-and-hole and middle peak means with b.In order to make camber reach requirement, in the middle of lower chord, the value of raising of interface should be f
on=f
under+ f, by calculating: b=2800f
on/ S.Therefore, lengthen the upper chord of truss, after making the girder upper chord length of the right and left respectively lengthen b, then link up with the truss pin, just can make camber reach requirement.Convenient in order to make main beam stress evenly reach actual fabrication, should be from the middle of girder, left and right symmetrically lengthens the upper chord of truss, and the amount of elongation a of every joint truss should equate.That is: when only lengthening the upper chord of two joint truss, should lengthen the upper chord of middle two joint truss, a=2b/2; When only lengthening the upper chord of four joint truss, the upper chord of four joint truss in the middle of should lengthening, a=2b/4; By that analogy, when lengthening n
1while saving the upper chord of truss, n in the middle of should lengthening
1the upper chord of joint truss, a=2b/n
1, n wherein
1for even number, and n
1<=n.During actual fabrication upper chord extended type truss, in order to make, truss is stressed evenly after should lengthening upper chord, to be made each protruding a/2 of negative and positive head, thereby makes each protruding a/2 of yin, yang head hole, and the invariant position of other member on truss.Be that upper chord size 90 lengthens as L
3'=90+a/2, the upper chord transverse holes is apart from lengthening as L
2'=3000+a, upper chord length lengthens as L
1'=3115+a.Because the lower chord value of raising f
onwith span, compare always very little, its ratio f
on/ S<1/200, so, although the gap between truss pin-and-hole and truss pin is small, also always can take this method to make camber reach requirement.
As shown in Figure 5, when the truss joint number n between the girder span is odd number, in order to make camber, reach requirement, also need the girder upper chord of the right and left is respectively lengthened to b, total amount of elongation of girder upper chord is 2b, by calculating: b=2800f
on/ (S-3000).Convenient in order to make main beam stress evenly reach actual fabrication, the truss that should make upper chord lengthen is positioned in the middle of girder, and the upper chord amount of elongation a of every joint truss should equate.That is: when only lengthening the upper chord of a joint truss, should lengthen the upper chord of middle node truss, a=2b; When only lengthening the upper chord of two joint truss, should lengthen the upper chord of middle symmetrical each first segment truss of girder span, a=2b/2; When only lengthening the upper chord of 3 joint truss, the upper chord of 3 joint truss in the middle of should lengthening, a=2b/3; When only lengthening the upper chord of four joint truss, should lengthen the upper chord of middle symmetrical each first-half truss of girder span, a=2b/4; By that analogy, when lengthening n
1while saving the upper chord of truss, should lengthen the middle n of girder
1the upper chord of joint truss, a=2b/n
1.n
1≦n。Work as n
1during for odd number, in the truss that upper chord lengthens, comprise middle node; Work as n
1during for even number, in the truss that upper chord lengthens, do not comprise middle node.During actual fabrication upper chord extended type truss, in order to make, truss is stressed evenly after should lengthening upper chord, to be made each protruding a/2 of negative and positive head, thereby makes each protruding a/2 of yin, yang head hole, and the invariant position of other member on truss.Be that upper chord size 90 lengthens as L
3'=90+a/2, the upper chord transverse holes is apart from lengthening as L
2'=3000+a, upper chord length lengthens as L
1'=3115+a.
In like manner, as shown in Fig. 5,7, when girder when assembled, obtains in order to make girder the camber required by 200 type truss, the upper chord length of girder the right and left respectively need be lengthened to b, girder upper chord total length lengthens 2b.While lengthening pricncipal rafter, should be from the middle of the girder span, left and right symmetrically lengthens the upper chord of truss, and the amount of elongation of every joint pricncipal rafter is a, a=2b/n
1, n wherein
1truss joint number for the upper chord lengthening.When the truss joint number n between the girder span is even number, b=4268f
on/ S, n
1for even number, and n
1<=n.When the truss joint number n between the girder span is odd number, b=4268f
on/ (S-3048), n
1<=n, and work as n
1during for odd number, in the truss that upper chord lengthens, comprise middle node; Work as n
1during for even number, in the truss that upper chord lengthens, do not comprise middle node.During actual fabrication upper chord extended type truss, in order to make, truss is stressed evenly should be made each protruding a/2 of truss negative and positive head, thereby make each protruding a/2 of yin, yang head hole, that is: upper chord size 95 lengthens as L
3'=95+a/2, make upper chord yin, yang head pitch-row lengthen as L
2'=3048+a, upper chord length lengthens as L
1'=3163+a, and on truss, other member position is all constant.
In sum, the truss that upper chord described in the utility model lengthens is:
A kind of upper chord extended type assembling truss, formed by 321 types and 200 type assembly type steel bridge on highway truss remodeling, for assembled lifting appliance girder.Fig. 8-9 are depicted as 321 type upper chord extended type framing elevations, by Components Compositions such as a cloudy montant, brace, upper chord, middle montant, lower chord, sun montants, be welded, its main material specification is: a cloudy montant, middle montant, a sun montant, brace are i iron No. 8, upper and lower chord member is No. 10 channel-section steels, its principal character size is: the vertical pitch-row of negative and positive head is H=1400, and a lower chord negative and positive transverse holes distance is L
2=3000, lower chord length is L
1=3115, upper chord transverse holes distance is L
2'=3000+a, upper chord length is L
1'=3115+a, the cloudy hole of upper chord is all L with a cloudy montant center to center distance, a Kong Yuyang montant center to center distance of sun
3'=90+a/2.a＝2b/n
1。N wherein
1the joint number that means upper chord extended type assembling truss on girder, and n
1<=n.When the truss joint number n between the girder span is even number, b=2800f
on/ S, n
1for even number.When between the girder span, joint number n is odd number, b=2800f
on/ (S-3000), n
1for integer.
Figure 10 shows that 200 type upper chord extended type framing elevations, by Components Compositions such as a cloudy montant, brace, upper chord, middle montant, lower chord, sun montants, be welded, its main material specification is: a cloudy montant, middle montant, a sun montant, brace are channel-section steel No. 8, and upper and lower chord member is No. 10 channel-section steels.Its principal character size is: the vertical pitch-row of negative and positive head is H=2134, and a lower chord negative and positive transverse holes distance is L
2=3048, lower chord length is L
1=3163, upper chord transverse holes distance is L
2'=3048+a, upper chord length is L
1'=3163+a, the cloudy hole of upper chord is all L with a cloudy montant center to center distance, a Kong Yuyang montant center to center distance of sun
3'=95+a/2.a＝2b/n
1。N wherein
1the joint number that means upper chord extended type assembling truss on girder, and n
1<=n.When the truss joint number n between the girder span is even number, b=4268f
on/ S, n
1for even number.When the truss joint number n between the girder span is odd number, b=4268f
on/ (S-3048), n
1for integer.
The principal character size of truss before and after remodeling is as follows with table 1, table 2 contrast:
Characteristic size (mm of unit) before and after table 1:321 type truss remodeling
Characteristic size (mm of unit) before and after table 2:200 type truss remodeling
Example: an electric block gantry crane is used in certain precast beam field, model MH10-24-A3, and rated load weight 10t, span 24m, without cantilever.Girder adopts double 321 type assembly type steel bridge on highway truss assembled, truss quality 270kg/ sheet, truss pin quality 3.12kg/, the electric block track adopts the 30b i iron, i iron and installation accessories quality 55kg/m, vertical supporting frame quality 23kg/ sheet, horizontal shore quality 35kg/ sheet.Examination design upper chord extended type truss, while making zero load, camber of crane main girder meets standard-required.
Separate: girder adopts 321 type truss assembled, and the lower chord pitch-row is L
2=3m, the truss joint number n=24/3=8 (joint) between the girder span
Girder is that double truss is assembled, adopts bracing frame quantity to be: 1/joint of vertical supporting frame, 1/joint of horizontal shore.
Girder deadweight: q=(270 * 2+23+35)/3+55=254.3kg/m=2492N/m
According to " assembly type steel bridge on highway multipurpose service manual ", consider that between truss pin-and-hole and truss pin, maximal clearance is 0.06cm, the non-resilient amount of deflection of girder is:
f
m＝0.06n
2＝0.06×8
2＝3.84cm＝38.4mm
The elastic deflection that the girder deadweight produces adopts Finite Element to try to achieve: f
0=28
: f
under=f
m+ f
0=38.4+28=66.4
F=(0.9～1.4) S/1000, get f=1.1 * 24000/1000=26.4
F
on=f
under+ f=66.4+26.4=92.8
According to table 1, b=2800f
on/ S=2800 * 92.8/24000=11
Consider that the b value is less, select only to lengthen the middle two joint truss of girder, n
1=2
a＝2b/n
1＝2b/2＝b＝11，a/2＝5.5
Girder adopts double 321 type truss assembled, c=2, m=cn
1=2 * 2=4, therefore need to make 4 joint upper chord extended type 321 type truss, its characteristic size parameter that need change is:
Claims (5)
1. a upper chord extended type assembling girder, comprise a plurality of unit truss (1), the two ends of described unit truss (1) are respectively equipped with sun head (11) and cloudy head (12), sun head (11), the cloudy head (12) of unit truss (1) link up by truss pin (2) after connecting successively, described unit truss (1) includes upper chord (3), lower chord (5), upper chord (3) and lower chord (5) are fixed by montant (4) and brace (6) assembly welding; It is characterized in that having in the unit truss between described girder span the length of Length Ratio lower chord (5) of upper chord (3) of part or all of unit truss long.
2. a kind of upper chord extended type assembling girder according to claim 1, the joint number that it is characterized in that the unit truss (1) between described girder span is even number, the long a of length of the Length Ratio lower chord (5) of the upper chord (3) of symmetrical unit truss in the middle of described girder span, total amount of elongation of the upper chord of unit truss is 2b=an
1; N wherein
1meaning the joint number of the unit truss that upper chord lengthens, is even number, and n
1the joint number that is less than or equal to the unit truss (1) between the girder span;
, f
on=f
under+ f, f
under=f
m+ f
0, f=(0.9～1.4) and S/1000, therefore
; Wherein H means the vertical pitch-row of a unit truss, f
onthe value of raising that means the middle interface of lower chord, f
underthe lower amount of deflection that means girder, f
mmean non-resilient amount of deflection, f
0mean elastic deflection; F means the camber of girder, and S means the span of girder.
3. a kind of upper chord extended type assembling girder according to claim 2, the amount of elongation a that it is characterized in that described unit pricncipal rafter is the a/2 that respectively stretches out on the sun head (11) at upper chord and cloudy (12).
4. a kind of upper chord extended type assembling girder according to claim 1, the joint number that it is characterized in that the unit truss (1) between the girder span is odd number, the long a of length of the Length Ratio lower chord (5) of the upper chord (3) of the unit truss in the middle of described girder span, total amount of elongation of upper chord is 2b=an
1, n wherein
1the joint number that means the unit truss that upper chord lengthens, and n
1the joint number that is less than or equal to the unit truss (1) between the girder span;
, f
on=f
under+ f, f
under=f
m+ f
0, f=(0.9～1.4) and S/1000, therefore
; Wherein H means the vertical pitch-row of a unit truss, f
onthe value of raising that means the middle interface of lower chord, f
underthe lower amount of deflection that means girder, f
mmean non-resilient amount of deflection, f
0mean elastic deflection; F means the camber of girder, and S means the span of girder, L
2the transverse holes distance that means the unit truss.
5. a kind of upper chord extended type assembling girder according to claim 4, the amount of elongation a that it is characterized in that described unit pricncipal rafter is the a/2 that respectively stretches out on the sun head (11) at upper chord and cloudy (12).
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103343508A (en) * | 2013-07-04 | 2013-10-09 | 田仁兰 | Upper chord lengthened type assembly type main beam |
| CN113059327A (en) * | 2021-04-07 | 2021-07-02 | 镇江金豪路桥配套工程有限公司 | Production process of Bailey sheet for assembled Bailey steel bridge |
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2013
- 2013-07-04 CN CN201320396187.2U patent/CN203373657U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103343508A (en) * | 2013-07-04 | 2013-10-09 | 田仁兰 | Upper chord lengthened type assembly type main beam |
| CN113059327A (en) * | 2021-04-07 | 2021-07-02 | 镇江金豪路桥配套工程有限公司 | Production process of Bailey sheet for assembled Bailey steel bridge |
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